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From: zx spectrumgomas <spectrumgomas@gmail.com>
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Subject: Re: Tortoise tutorial
Date: Tue, 10 Jan 2012 18:37:10 +0100
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I had already tested that. I don't know why, but it doesn't work.

I added:
#include <locale.h>

setlocale(LC_NUMERIC,"C");    before the execlp ("gnuplot", NULL);

or

setenv("LC_NUMERIC","C",1);  before the execlp ("gnuplot", NULL);


It compiles, but the bug remains.